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TOKYO (Reuters) - Japan's economy contracted more than expected at the start of this year, breaking the longest run of growth seen for decades, in a blow to Prime Minister Shinzo Abe's reflationary 'Abenomics' polices.

Wednesday's data marked the end to eight straight quarters of economic expansion, which was the longest sequence of growth since a 12-quarter run between April-June 1986 and January-March 1989 during the asset-inflated bubble economy.

The economy shrank by 0.6 percent on an annualised basis, a much more severe contraction than the median estimate for an annualised 0.2 percent.

Fourth quarter growth was revised to an annualised 0.6 percent, down from the 1.6 percent estimated earlier.

Economists say the contraction will be temporary, but there is a risk that trade friction with the United States will hurt export demand, meaning a strong recovery is not assured.

"The economy is unlikely to continue to contract further. The global economy is performing well and a yen is trading beyond 110 yen against the dollar, so once exports start to grow again, the economy will return to a moderate growth path."

Capital expenditure fell 0.1 percent, down for the first time in six quarters, suggesting corporate investment is not as strong as many economists had forecast. The median estimate was for a 0.4 percent increase.

Wednesday's figures may presage data due on Thursday that is forecast to show core machinery orders, a leading indicator of capital expenditure, fell in March for the first time in three months.Compared to the previous quarter, gross domestic product (GDP) fell 0.2 percent, more than the median estimate for GDP to be flat, and following a downwardly revised 0.1 percent quarter-on-quarter expansion in October-December, Cabinet Office data showed on Wednesday.

Consumer spending fell marginally, registering a decline of less than one percentage point in the first quarter. The median estimate was for consumer spending to remain unchanged.

However, a breakdown of the data shows export growth is losing momentum, expanding 0.6 percent in the first quarter after growth of 2.2 percent expansion in the fourth quarter.

Japan's government is preparing for its annual announcement of guidelines for economic and fiscal policy, but the government has been distracted by allegations of cronyism that have hurt Abe's approval ratings.